Ventilation of electric railway-motors.



PATENTED DEC. 31, 1907.

4 G. GIBBS.

VENTILATION OI ELECTRIC RAILWAY MOTORS.

APPLICATION FILED JULY 24, 1907.

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PATENTED DEG. 31, 1907. G. GIBBS.

VENTILATION OF ELECTRIC RAILWAY MOTORS.

APPLICATION FILED JUL-T24, 1907.

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action of the motor and GEORGE GIBBS, OF NEW YORK, N. Y. VENTILATION OF ELECTRIC BAILWAY-MOTORQ.

Specification of Letters Patent. Application filed ly 2t. 1907. Serial No. 885.881

Patented Dec. 31. 1907.

To all whom it may cancer-n:

Be it known, that I, Gsonon GIBBS, a citizen of the United States, residi at New Yorlgin the county and State of ew York, have invented certain new and useful Improvements in Ventilation of Electric Railway-Motors, of which the following is a specification, reference being had to the drawings accompanying and forming part of the same. My invention relates to t e ventilation of electric railway motors, more particularly motors mounted in swivel trucks.

As is well known, one of the difficulties of high-speed electric traction is the danger of overheating the motors. This follows from the fact that by reason of the restricted space available on the car for the motors the latter must be small in proportion to-the power which they are required, at times at least, to develop. The result is that themotors are liable to uent injury. Modern practice in the design of electric motors provides for ventilation thereof, to a limited extent, by a fan by air-ducts in the structure of the motor. But experience has shown that these provisions are not suilicient to keep themotor at asafe temperature in high speed work. I have therefore been led to devise my )resent invention, which has for its object t provide a simple and effective system for ventilating the motor by directing thereon a blast or current of air, p

which will absorb and carry away the heat generated in the motor..

To this end the invention consists in the novel features of construction and combinations of elements hereinafter described and more particularly set forth in the claims.

The tion is illustrated in which,

Figure 1 is a side vew of one end of a motor car having my invention applied thereto. Fig. 2 is a sectional lan view of aportion of one of the trucks siowing the connections and arrangements of the various air passages. Fig.- 3 is a section substantially on ine Fig. 4 is a section substantially on line IY-IV of Fig. 2.

Referring now to the drawings, -1 is the car body, and 2 3 are the customary outer casings of two driv'iiig-iiiotors, mounted in the usual way-on the axles 4 5 respectively. Suspended from the bottom of the car is a fan or blower 6 of any suitable type, actuated in the annexed drawings,

'duct- 15, so that become overheated, with conse referred embodiment of the inven-' bolster around the center-pin may by a motor 7, connected therewith in any convenient and suitable manner.

Sis the bed center-plate on the bottom of the car, provi ed witha downwardly extending pivot-member 9, the end of. which fits a correspondini bearing on the hollow truck bolster l0. xtending vertically within the pivot-member 9 is a central bearinglll, registering with acentral aperture in the truck-bolster 10, to receive the usual centerpin 12.

Concentric with the pivot member 9is an annular casin 13, extending .preferabl below the top Q a flange 14 around the I earing, on the tIUQk-wbOiSliQl', of the ivot member 9. -'lhe annular chamber t us formed concentric withthe center late pivot-member is connected with the b ower 6 byan air the current of :air from the blower will be delivered into the chamber mentioned.

e top of Inside the flange 14 the top of the truck I bolster is provided casing 13 passes into the hollow bolster. In order to prevent escape of air between the casing and the flange I prefer .to employ a suitable packing or air-seal which .will permit the necessary movement of the bolster relativeto the casing, instead of trying to make a close {it between the parts themselves. A convenient and effective packing for the pur-,

of U-shaped crosssection, made of leather, spring-metal, or other suitable resilient material, and iiiterposci'l between the overlaping portions of the casing 13 and ilango 14. "his ring yields freely to the motion of the truck and in all positions of the, latter fits closely the inner and outer surfaces of the casing and flange rcspcctivcly,while the effect of the slight air pressure inside the casing is to press the upstanding sides of the ring into closer engagement with their cooperating surfaces. To obviate any possibility of the ring being forced out of position the flange 14 may be rovided with an outwardly extending rib ing the casing.

In order to prevent escape of air from the the bolster be provided with an inner depending cup 18, which iiicloses the center-pin aperture. Only a, negligible amount of air, if any, can escape between the pivot-member 9 space between the flange and the with one or more air openings 16, through which the air from the ose is shown in Fig. 3, and consists of a ring 7 below the ring, substantially closand its bearing on the truck-bolster, since these parts d themselves to a close fit, as will be readi y understood. From the truckbolster the air passes downward through .an opening 19 into a depending conduit 20 fitted t ereover, from'whlch branch pipes 21 lead the air into the motor casings. From the I lapsing, interlor sleeves 23 latter the air escapes through suitable apertures, not shown. 7

In orderto permit movement of the motors, due to the swiveling of the truck, and the up-and-down motion due to 'the'carsprings, the branch pipes 21 have flexible portions 22', in bellows form. The bellows may be made of light material; such as rubber; and to revent the bellows from col- Ilia 'be provided, carried by the rigid portions of the pipes.

' The rear end of the car is not shown in Fig. 1; but it is clear'that if motors are provided for'the rear axles these motors may be' a ventilated, and thereby cooled, in the same manner, the air therefor being supplied by the blower 6, or by an independent blower, 'not shown. I

It will now be seen that the system of ven tilation provided by my invention is simple and effective. With suitable modifications it may be applied to existing types of motor trucks other than that illustrated, without material change in the trucks themselves.

What I claim is:

1. In a system-for the ventilation of electric railway motors, the combination with a 2. In a system for the ventilation ofelectric railway motors, the combination with a car, a truck swiveled thereto, andone or more motors carried in the truck, of a blower carried by the car, an annular casing carried by the car, concentric with the swivel connection of the car and truck, an air-seal interposed between the casing and the adjacent portion of the truck, an air duct leading from the blower and discharging air into said casing, and means carried by the truck for leading air from said chamber to the mo-' tor or motors, as set forth.

3. In a system for the ventilation of electric railway motors, the combination with a car, a depending pivot-member carried on the bottom thereof; a truck having a bearing for said pivot-member and provided with airassages outside said bearing, and one or more motors carried in the truck, of a blower carried by the car, a casing carried by the -ear, inclosing the'said passages and formin an air chamber in cenglunetion with sai ivot member, an air-duct leading from the lowerinto said chamber, and means, for leading air from the said air passages, outside of the said bearing, to the motor or motors' as set forth.

4. In a system .for the ventilation of elec-. tric railway motors, the combination of the depending pivot-member of a car, a truck having a ho low bolster provided with a bearing for said pivot-member, and with airpassages outside of said bearing and leading to the interior of the bolster, a casing concentric with the pivot-member, extending downward into juxtaposition to the said airpassages of the bolsterto inclose the same, and-an air-pipe leading from the hollow bolster, as set forth.

5. In a system for the ventilation of electric railway motors, the combination with the swivel connection of a car and a truck, comprising a pivot-member carried by the in car and a bearing therefor carried by the truck; of -a casing concentric with said swivel connection, stationary relatively to one of the parts thereof and forming in con-' junction with the swivel connection an air chamber, and means for. leading air from the .said air-chamber to one or more motors carried'i'n the truck, as set forth. y 6. In a system for the ventilation of electric railway motors, the combination with the swivel connection'of a car and a truck, comprising a pivot'member carried by the car and a bearing therefor carried by thetruck; of a casing concentric with the said swivel connection, stationary relatively to one of the parts thereof and forming in 'con-- 105 junction with the swivel connection an air- -chamber, an air-seal interposed between the casing andthe relatively movable art of the swivel connection, and a pipe for eading air from the said air-chamber to one or more motors carried in the truck, as set forth.

7. In a system for the ventilation of elec tric railway motors, the; combination with the swivel connection of a car and a truck," comprising a pivot member carried bythe car anda bearing-therefor carried by the truck; of a casing concentric with the swivel connection and stationaryrelatively to one of the parts thereof, and an air-seal interposed between the casing and the relatively movable part of the swivel connection, comprising a member of U -shaped cross-section having its sides engaging the adjacent portions of the casing and the swivel connection, as set forth.

8. In a system for the ventilation of electric railway motors, in combination, a pivot member depending from the bottom of a car and having a socket for a center'pin, a truck having a hollowbolster provided on its top 13 0 with a bearing for the pivot member, with an aperture for the center-pin inside said bearing, and with air-apertures outside said bearing, a cup within-the bolster and inclosing the center-pin aperture, a casing concentric with the pivot-member, stationary relatively thereto and extending into proximity to the truck bolster, a flange extending upwardly from the latter outside of its air-apertures and into the said casing, and a packinginterposed between \the flange and the casing, as set forth.

9. In a system for the ventilation of eleccar and the truck, one or more motors carried in the truck, a blower carried by the car, an air chamber concentric with and outside of the swivel connection,- an air-duct connecting the blower and said chamber, and means for leading air from the chamber to the motor or motors, as set forth.

' GEORGE GIBBS. Witnesses:

-W. L. MURRAY, 8. S; DUNHAM. 

